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vacuum secondary question

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  • Werner R.
    Expired
    • March 3, 2008
    • 184

    vacuum secondary question

    ok. my baby is a 64 with a 427 and hydraulic lifters; 4" restricted flow hooker sidepipes. a good driver. holley 1850. i used a hairpin on the secondary shaft and took the car out for some back road acceleration tests. quit when i reached 90+ mph.

    the hairpin had moved about 1/4 to 5/16 inch down the shaft. does this suggest full opening of the secondaries, or should i look for greater hairpin travel??

    if it is not full opening, should i put in lighter springs [i have the plain standard spring in there now].

    also, i did read some internet advice that said the check ball should be removed [for earlier secondary activation]. i have mine in place.

    any advice appreciated. happy motoring and wrenching to all [i almost said happy wenching, but at my age "wrench" comes to mind].
  • John H.
    Beyond Control Poster
    • December 1, 1997
    • 16513

    #2
    Re: vacuum secondary question

    Originally posted by Werner Reis (48687)
    also, i did read some internet advice that said the check ball should be removed [for earlier secondary activation]. i have mine in place.
    Werner -

    Typical bad internet advice. Leave the check ball alone - if it's removed, the secondaries will "snap" open and you'll get a "bog" due to inadequate initial fuel flow in the secondaries.

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    • Clem Z.
      Expired
      • January 1, 2006
      • 9427

      #3
      Re: vacuum secondary question

      here are holley specs on the different springs.
      Attached Files

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